Add chrome-side code for autoreload experiment.

chrome/renderer/net/net_error_helper.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/net/net_error_helper.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/json/json_writer.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/localized_error.h"
 #include "chrome/common/net/net_error_info.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/net/error_cache_load.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/url_constants.h"
@@ skipping 57 matching lines @@
 }
 
 }  // namespace
 
 NetErrorHelper::NetErrorHelper(RenderFrame* render_view)
     : RenderFrameObserver(render_view),
       content::RenderFrameObserverTracker<NetErrorHelper>(render_view),
       core_(this) {
   RenderThread::Get()->AddObserver(this);
   CommandLine* command_line = CommandLine::ForCurrentProcess();
-  bool auto_reload_enabled =
-      command_line->HasSwitch(switches::kEnableOfflineAutoReload);
+  std::string field_trial_group =
+      base::FieldTrialList::FindFullName("AutoReloadExperiment");
+  bool auto_reload_enabled = false;

[mmenke, 2014/03/28 14:54:02]

nit:  Do we really need this bool?

+
+  if (field_trial_group == "Enabled" ||
+      command_line->HasSwitch(switches::kEnableOfflineAutoReload))

[mmenke, 2014/03/28 14:54:02]

nit:  Use braces {} when if statement+body takes up more than 2 lines.

+    auto_reload_enabled = true;
   core_.set_auto_reload_enabled(auto_reload_enabled);
 }
 
 NetErrorHelper::~NetErrorHelper() {
   RenderThread::Get()->RemoveObserver(this);
 }
 
 void NetErrorHelper::DidStartProvisionalLoad() {
   blink::WebFrame* frame = render_frame()->GetWebFrame();
   core_.OnStartLoad(GetFrameType(frame), GetLoadingPageType(frame));
@@ skipping 170 matching lines @@
   if (!response.isNull() && response.httpStatusCode() == 200) {
     core_.OnNavigationCorrectionsFetched(
         data, render_frame()->GetRenderView()->GetAcceptLanguages(),
         LocaleIsRTL());
   } else {
     core_.OnNavigationCorrectionsFetched(
         "", render_frame()->GetRenderView()->GetAcceptLanguages(),
         LocaleIsRTL());
   }
 }